Josip Blažević, Java Developer in Zagreb, Croatia
Josip Blažević

Java Developer in Zagreb, Croatia

Member since April 1, 2017
For over the past 17 years, Josip has worked as a software engineer developing and integrating mission-critical enterprise applications and systems. He specializes in current front-end and Java-based back-end technologies and is extremely adept at finding the most-simple-but-effective solutions for complex engineering problems. Through his many leadership roles, he has developed strong communication skills and a proactive, can-do mentality.
Josip is now available for hire


  • Celarent Ltd.
    Liferay, Swagger, REST, JAX-RS, OSGi, Vue.js, CSS3, HTML5, JavaScript, JEE, Java
  • S&T Hrvatska d.o.o
    Oracle Database, Data Warehouse Design, Data Warehousing, IBM Filenet...
  • S&T Hrvatska d.o.o
    Node.js, Scala, Java, Informatica PowerExchange, Oracle Database...


  • Java 13 years
  • SQL 13 years
  • JavaScript 10 years
  • Requirements Analysis 10 years
  • Software Architecture 8 years
  • Enterprise Integration 8 years
  • Spring 6 years
  • React 2 years


Zagreb, Croatia



Preferred Environment

IntelliJ IDEA, Git, Vim Text Editor, Eclipse, Linux, MacOS

The most amazing...

...code I've implemented is an IEEE spec-compliant compiler for the VHDL hardware description language.


  • Software Engineering Architecture Consultant

    2017 - PRESENT
    Celarent Ltd.
    • Worked as a self-employed software engineering and architecture consultant.
    • Developed a public-facing customer self care portal for a major telecom provider.
    • Established the development framework and incorporated the needed technologies and libraries.
    • Sliced the CSS, HTML, and SVG assets from the supplied UX designs.
    • Developed an OpenID Connect integration module for SSO.
    Technologies: Liferay, Swagger, REST, JAX-RS, OSGi, Vue.js, CSS3, HTML5, JavaScript, JEE, Java
  • Applications Manager

    2013 - 2016
    S&T Hrvatska d.o.o
    • Led a 15-person team focused on enterprise application and solution development.
    • Worked on a variety of projects, including custom application development, data warehousing/BI, and the development of document management solutions.
    • Managed people, finances, pre-sales, contract negotiations, and project delivery.
    • Maintained my own technical skills and performed development work when needed.
    • Developed a public-facing case law portal for the Supreme Court of the Republic of Croatia and integrated it with the European Commission's European e-Justice Portal.
    Technologies: Oracle Database, Data Warehouse Design, Data Warehousing, IBM Filenet, Apache Tomcat, Apache, Solr, JEE, Java
  • Principal Consultant | Project Manager

    2011 - 2013
    S&T Hrvatska d.o.o
    • Managed the vendor side of a complete data warehouse redesign project for a major telecom. Led a 10-person team, with a total of ~40 people participating on both sides.
    • Established a sound requirement management discipline and a predictable development process. Insisted on an open, transparent process and sincere communication.
    • Established quality criteria and drove the development of test automation.
    • Developed tools that helped made the project team more efficient, including specialized reporting and coordination tools for the project tracking system, using Scala and Node.js.
    • Completed the project successfully, resulting in strong client satisfaction and ongoing work for the company.
    Technologies: Node.js, Scala, Java, Informatica PowerExchange, Oracle Database, Data Warehouse Design, Data Warehousing
  • Chief Software Engineer

    2006 - 2011
    • Acted as the team leader/architect role on various custom software development projects for the banking and telecom industry.
    • Led the development of two custom CRM solutions for the largest Croatian bank based on the IBM WebSphere Portal.
    • Integrated enterprise systems with technologies like z/OS CICS, IBM MQ, IBM Message Broker, Web Services, and more.
    • Led the development of a public website for a telecom company based on Liferay Portal.
    • Influenced technology choices and software architecture across the department projects.
    Technologies: WebSphere, Portlets, IBM Db2, Web Services, JAX-WS, Hibernate, Spring MVC, Spring, JEE, Java
  • Software Engineer

    2003 - 2006
    Combis Ltd.
    • Acted in the software developer role on various projects for the banking industry.
    • Developed a Java/Swing based client-server debt collection system.
    • Developed an outbound call management integration, agent conversation script functionality, and a web chat for an IP call center system.
    • Invented AJAX-style iframe-based dynamic communication for the web chat app in 2004, a year before the AJAX term was coined.
    • Acted in the capacity of the first team lead/project manager role for a debt collection system for a new customer (after working there for 2 years). The project was named the best of 2005 for the customer.
    Technologies: Cisco, IBM Db2, Hibernate, Apache Struts, Enterprise Java Beans (EJB), Servlet, Swing, Java


  • Portal of Case Law for the Supreme Court of the Republic of Croatia

    This is a custom portal based on Java Servlets, Struts, HTML5, and jQuery and backed by the Solr search engine. It's a high performance law document search with custom stemming for the Croatian language. It's also integrated with the European Commission's European e-Justice Portal for which it provides a source of Croatian case law decisions. Its social impact is that it has democratized and sped up access to Croatian case law material and made it easy to be consumed by lawyers, judges, law students, and the general public. Its political impact was that it furthered Croatia's European integrations.


  • Languages

    SQL, Java, JavaScript, UML, CSS3, HTML5, C, ECMAScript (ES6), Haskell, BPEL, Scala, C++, Rust
  • Frameworks

    JPA, Rational Unified Process (RUP), Spring MVC, JavaServer Pages (JSP), Hibernate, Spring, Apache Struts 2, Mockito, Swing, JUnit, OSGi, Swagger, Apache Struts, Arquillian
  • Libraries/APIs

    Vue.js, JAXB, JAX-WS, JMS, JSR 286, JSR 168, JDBC, JSTL, React, JAX-RS, jQuery, jQuery UI, Node.js
  • Tools

    Servlet, Eclipse IDE, IBM Rational, JBoss Drools, Maven, Apache Tomcat, Redmine, Vim Text Editor, Apache Ant, Java Concurrency, Apache HTTP Server, Apache Solr, Solr, Apache, IBM Filenet, Informatica PowerExchange, IntelliJ IDEA, Microsoft Visual Studio, Git, Jira, Mercurial, Apache JMeter, Subversion (SVN), GCC, Webpack 2
  • Paradigms

    Object-oriented Design (OOD), Object-oriented Programming (OOP), Requirements Analysis, BPMN, REST, Test-driven Development (TDD), Functional Programming, Responsive, Scrum
  • Platforms

    IBM WebSphere, JEE, Linux, MacOS, Eclipse, WebSphere, Oracle Database, WebSphere MQ
  • Other

    Portlets, Software Architecture, Data Modeling, Enterprise Software, Enterprise Integration, Debugging, Troubleshooting, EJB 3, Embedded Software, Apache Commons, Enterprise Integration Patterns (EIP), Liferay, HTTPS, HTTP, Project Planning, Hamcrest, SOAP, Enterprise Architecture, Data Warehousing, Web Services, Cisco, Data Warehouse Design, g++, Network Programming, Ubuntu Server, Enterprise Java Beans (EJB)
  • Industry Expertise

    Project Management
  • Storage

    Elasticsearch, PostgreSQL, IBM Db2, JSON/XML Schemas


  • Master's degree in Computer Engineering
    1998 - 2003
    University of Zagreb, Faculty of Electrical Engineering and Computing - Zagreb, Croatia

To view more profiles

Join Toptal
Share it with others